列表返回空值

Question

我使用這個代碼，但它返回空值。當我調試我的代碼，顯示其給出的空值

List<TextJson> textList = null; 
    try{ 
     textList = new ArrayList<TextJson>(); 
     Cursor cursor = db.rawQuery("SELECT * FROM "+TABLE_TEXTS + " WHERE " + KEY_CATE + " = '" + text_spinner1 + " ' " , null); 
      Log.e("Cursor is","==>"+cursor); 
      Log.e("0_0", "0_0 1=>"); // code working on here 
     if(!cursor.isLast()) 
      { 
      Log.e("Hey","last"); 
      while (cursor.moveToNext()) 
      { 
       TextJson txtlist = new TextJson(); 
       txtlist.setId(cursor.getInt(0)); 
       txtlist.setText_status(cursor.getString(1)); 
       textList.add(txtlist); 
      } 
     } 
     db.close(); 
    }catch (Exception e){ 
     Log.e("error","is==> " +e); 
    } 
    return textList; // null value 

我的日誌

E/Spinner value is: --=> speech 
E/inside: getDetailtospinner 
E/Cursor is: ==>android.database.sqlite.SQLiteCursor@41b0f5d8 
E/0_0: 0_0 1=> 
E/Hey: last 

幫我出這一點。

Answer 1

變化

Cursor cursor = db.rawQuery("SELECT * FROM "+TABLE_TEXTS + " WHERE " + KEY_CATE + " = '" + text_spinner1 + " ' " , null); 

到

Cursor cursor = db.rawQuery("SELECT * FROM "+TABLE_TEXTS + " WHERE " + KEY_CATE + " = '" + text_spinner1 + "'" , null); 
// or Cursor cursor = db.rawQuery("SELECT * FROM "+TABLE_TEXTS + " WHERE " + KEY_CATE + " LIKE '" + text_spinner1 + "'" , null);